test_typing has strange assertIsInstance calls

[sobolevn]

Bug report

These line are problematic:

cpython/Lib/test/test_typing.py

Lines 2013 to 2020 in 264f4af

	with self.assertRaises(TypeError):
	self.assertIsInstance(f, Callable[[], None])
	with self.assertRaises(TypeError):
	self.assertIsInstance(f, Callable[[], Any])
	with self.assertRaises(TypeError):
	self.assertNotIsInstance(None, Callable[[], None])
	with self.assertRaises(TypeError):
	self.assertNotIsInstance(None, Callable[[], Any])

Why?

1. self.assertIsInstance gives the intention that this will return True
2. self.assertNotIsInstance gives the intention that this will return False
3. Technically self.assert[Not]IsInstance can raise TypeError on its own (but not in practice)

However, this will always fail with TypeError.
I propose to use just isintance instead.

Linked PRs

• gh-111126: Use isinstance instead of assert[Not]IsInstance in test_typing #111127
• [3.12] gh-111126: Use isinstance instead of assert[Not]IsInstance in test_typing (GH-111127) #111130
• [3.11] gh-111126: Use isinstance instead of assert[Not]IsInstance in test_typing (GH-111127) #111131